bisecting fixing commit since 2c746135a12e3f329171ed168ca0078d468f6d85 building syzkaller on 0767f13fbd87c99aea7893eb64199b76be42cd61 testing commit 2c746135a12e3f329171ed168ca0078d468f6d85 with gcc (GCC) 8.1.0 kernel signature: 2d172aab0a6a3b1b941602795d5a1c271104c04bae224e3fc76fc4a58a6effec run #0: crashed: INFO: task hung in scsi_block_when_processing_errors run #1: crashed: INFO: task hung in __ext4_find_entry run #2: crashed: INFO: task hung in __ext4_find_entry run #3: crashed: INFO: task hung in __ext4_find_entry run #4: crashed: INFO: task hung in __ext4_find_entry run #5: crashed: INFO: task hung in __ext4_find_entry run #6: crashed: INFO: task hung in __ext4_find_entry run #7: crashed: INFO: task hung in __ext4_find_entry run #8: crashed: INFO: task hung in __ext4_find_entry run #9: OK testing current HEAD 13d2ce42de8cb98ff952f8de6307f896203854c2 testing commit 13d2ce42de8cb98ff952f8de6307f896203854c2 with gcc (GCC) 8.1.0 kernel signature: dfb2d515826b88a83dc43b2ba2784683bc264f96c5c4bfec7009cc1b98efde3e run #0: crashed: INFO: task hung in scsi_block_when_processing_errors run #1: crashed: INFO: task hung in __ext4_find_entry run #2: crashed: INFO: task hung in scsi_block_when_processing_errors run #3: crashed: INFO: task hung in __ext4_find_entry run #4: crashed: INFO: task hung in __ext4_find_entry run #5: crashed: INFO: task hung in __ext4_find_entry run #6: crashed: INFO: task hung in __ext4_find_entry run #7: crashed: INFO: task hung in __ext4_find_entry run #8: crashed: INFO: task hung in __ext4_find_entry run #9: OK revisions tested: 2, total time: 39m29.188686341s (build: 17m50.837291347s, test: 20m57.938622758s) the crash still happens on HEAD commit msg: Linux 4.19.163 crash: INFO: task hung in __ext4_find_entry sd 0:0:1:0: device reset sd 0:0:1:0: device reset sd 0:0:1:0: device reset sd 0:0:1:0: device reset sd 0:0:1:0: device reset INFO: task syz-executor.0:7843 blocked for more than 140 seconds. Not tainted 4.19.163-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D23800 7843 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 io_schedule+0x1c/0x70 kernel/sched/core.c:5185 bit_wait_io+0xf/0x90 kernel/sched/wait_bit.c:207 __wait_on_bit+0xd5/0x170 kernel/sched/wait_bit.c:48 out_of_line_wait_on_bit+0xde/0x110 kernel/sched/wait_bit.c:63 wait_on_bit_io include/linux/wait_bit.h:101 [inline] __wait_on_buffer+0x52/0x60 fs/buffer.c:118 wait_on_buffer include/linux/buffer_head.h:362 [inline] __ext4_find_entry+0x8cc/0xe00 fs/ext4/namei.c:1446 ext4_find_entry fs/ext4/namei.c:1515 [inline] ext4_unlink+0x1f6/0xfe0 fs/ext4/namei.c:3086 vfs_unlink+0x23b/0x430 fs/namei.c:4002 do_unlinkat+0x427/0x670 fs/namei.c:4065 __do_sys_unlink fs/namei.c:4112 [inline] __se_sys_unlink fs/namei.c:4110 [inline] __x64_sys_unlink+0x39/0x50 fs/namei.c:4110 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45dc07 Code: Bad RIP value. RSP: 002b:00007ffe773bf478 EFLAGS: 00000246 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045dc07 RDX: 00007ffe773bf490 RSI: 00007ffe773bf490 RDI: 00007ffe773bf520 RBP: 0000000000001a57 R08: 0000000000000000 R09: 0000000000000011 R10: 000000000000000a R11: 0000000000000246 R12: 00007ffe773c05b0 R13: 0000000002f57a60 R14: 0000000000000000 R15: 00007ffe773c05b0 INFO: task syz-executor.3:7844 blocked for more than 140 seconds. Not tainted 4.19.163-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D23848 7844 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 io_schedule+0x1c/0x70 kernel/sched/core.c:5185 bit_wait_io+0xf/0x90 kernel/sched/wait_bit.c:207 __wait_on_bit+0xd5/0x170 kernel/sched/wait_bit.c:48 out_of_line_wait_on_bit+0xde/0x110 kernel/sched/wait_bit.c:63 wait_on_bit_io include/linux/wait_bit.h:101 [inline] __wait_on_buffer+0x52/0x60 fs/buffer.c:118 wait_on_buffer include/linux/buffer_head.h:362 [inline] __ext4_find_entry+0x8cc/0xe00 fs/ext4/namei.c:1446 ext4_find_entry fs/ext4/namei.c:1515 [inline] ext4_unlink+0x1f6/0xfe0 fs/ext4/namei.c:3086 vfs_unlink+0x23b/0x430 fs/namei.c:4002 do_unlinkat+0x427/0x670 fs/namei.c:4065 __do_sys_unlink fs/namei.c:4112 [inline] __se_sys_unlink fs/namei.c:4110 [inline] __x64_sys_unlink+0x39/0x50 fs/namei.c:4110 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45dc07 Code: Bad RIP value. RSP: 002b:00007ffc08971a78 EFLAGS: 00000246 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045dc07 RDX: 00007ffc08971a90 RSI: 00007ffc08971a90 RDI: 00007ffc08971b20 RBP: 0000000000001aa8 R08: 0000000000000000 R09: 0000000000000011 R10: 000000000000000a R11: 0000000000000246 R12: 00007ffc08972bb0 R13: 0000000001ef5a60 R14: 0000000000000000 R15: 00007ffc08972bb0 INFO: task syz-executor.4:7847 blocked for more than 140 seconds. Not tainted 4.19.163-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D23800 7847 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 io_schedule+0x1c/0x70 kernel/sched/core.c:5185 bit_wait_io+0xf/0x90 kernel/sched/wait_bit.c:207 __wait_on_bit+0xd5/0x170 kernel/sched/wait_bit.c:48 out_of_line_wait_on_bit+0xde/0x110 kernel/sched/wait_bit.c:63 wait_on_bit_io include/linux/wait_bit.h:101 [inline] __wait_on_buffer+0x52/0x60 fs/buffer.c:118 wait_on_buffer include/linux/buffer_head.h:362 [inline] __ext4_find_entry+0x8cc/0xe00 fs/ext4/namei.c:1446 ext4_find_entry fs/ext4/namei.c:1515 [inline] ext4_unlink+0x1f6/0xfe0 fs/ext4/namei.c:3086 vfs_unlink+0x23b/0x430 fs/namei.c:4002 do_unlinkat+0x427/0x670 fs/namei.c:4065 __do_sys_unlink fs/namei.c:4112 [inline] __se_sys_unlink fs/namei.c:4110 [inline] __x64_sys_unlink+0x39/0x50 fs/namei.c:4110 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45dc07 Code: Bad RIP value. RSP: 002b:00007ffe062cc338 EFLAGS: 00000246 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045dc07 RDX: 00007ffe062cc350 RSI: 00007ffe062cc350 RDI: 00007ffe062cc3e0 RBP: 0000000000001ac2 R08: 0000000000000000 R09: 0000000000000011 R10: 000000000000000a R11: 0000000000000246 R12: 00007ffe062cd470 R13: 0000000001ae1a60 R14: 0000000000000000 R15: 00007ffe062cd470 INFO: task syz-executor.5:7848 blocked for more than 140 seconds. Not tainted 4.19.163-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D23376 7848 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 io_schedule+0x1c/0x70 kernel/sched/core.c:5185 bit_wait_io+0xf/0x90 kernel/sched/wait_bit.c:207 __wait_on_bit+0xd5/0x170 kernel/sched/wait_bit.c:48 out_of_line_wait_on_bit+0xde/0x110 kernel/sched/wait_bit.c:63 wait_on_bit_io include/linux/wait_bit.h:101 [inline] __wait_on_buffer+0x52/0x60 fs/buffer.c:118 wait_on_buffer include/linux/buffer_head.h:362 [inline] __ext4_find_entry+0x8cc/0xe00 fs/ext4/namei.c:1446 ext4_find_entry fs/ext4/namei.c:1515 [inline] ext4_unlink+0x1f6/0xfe0 fs/ext4/namei.c:3086 vfs_unlink+0x23b/0x430 fs/namei.c:4002 do_unlinkat+0x427/0x670 fs/namei.c:4065 __do_sys_unlink fs/namei.c:4112 [inline] __se_sys_unlink fs/namei.c:4110 [inline] __x64_sys_unlink+0x39/0x50 fs/namei.c:4110 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45dc07 Code: Bad RIP value. RSP: 002b:00007ffceb5575f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045dc07 RDX: 00007ffceb557610 RSI: 00007ffceb557610 RDI: 00007ffceb5576a0 RBP: 0000000000001aa5 R08: 0000000000000000 R09: 0000000000000011 R10: 000000000000000a R11: 0000000000000246 R12: 00007ffceb558730 R13: 0000000003364a60 R14: 0000000000000000 R15: 00007ffceb558730 INFO: task syz-executor.1:7849 blocked for more than 140 seconds. Not tainted 4.19.163-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D23848 7849 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 io_schedule+0x1c/0x70 kernel/sched/core.c:5185 bit_wait_io+0xf/0x90 kernel/sched/wait_bit.c:207 __wait_on_bit+0xd5/0x170 kernel/sched/wait_bit.c:48 out_of_line_wait_on_bit+0xde/0x110 kernel/sched/wait_bit.c:63 wait_on_bit_io include/linux/wait_bit.h:101 [inline] __wait_on_buffer+0x52/0x60 fs/buffer.c:118 wait_on_buffer include/linux/buffer_head.h:362 [inline] __ext4_find_entry+0x8cc/0xe00 fs/ext4/namei.c:1446 ext4_find_entry fs/ext4/namei.c:1515 [inline] ext4_unlink+0x1f6/0xfe0 fs/ext4/namei.c:3086 vfs_unlink+0x23b/0x430 fs/namei.c:4002 do_unlinkat+0x427/0x670 fs/namei.c:4065 __do_sys_unlink fs/namei.c:4112 [inline] __se_sys_unlink fs/namei.c:4110 [inline] __x64_sys_unlink+0x39/0x50 fs/namei.c:4110 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45dc07 Code: Bad RIP value. RSP: 002b:00007ffc4758bf38 EFLAGS: 00000246 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045dc07 RDX: 00007ffc4758bf50 RSI: 00007ffc4758bf50 RDI: 00007ffc4758bfe0 RBP: 0000000000001ada R08: 0000000000000000 R09: 0000000000000011 R10: 000000000000000a R11: 0000000000000246 R12: 00007ffc4758d070 R13: 0000000002610a60 R14: 0000000000000000 R15: 00007ffc4758d070 INFO: task syz-executor.2:28456 blocked for more than 140 seconds. Not tainted 4.19.163-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D29512 28456 7841 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 io_schedule+0x1c/0x70 kernel/sched/core.c:5185 bit_wait_io+0xf/0x90 kernel/sched/wait_bit.c:207 __wait_on_bit+0xd5/0x170 kernel/sched/wait_bit.c:48 out_of_line_wait_on_bit+0xde/0x110 kernel/sched/wait_bit.c:63 wait_on_bit_io include/linux/wait_bit.h:101 [inline] __wait_on_buffer+0x52/0x60 fs/buffer.c:118 wait_on_buffer include/linux/buffer_head.h:362 [inline] __ext4_find_entry+0x8cc/0xe00 fs/ext4/namei.c:1446 ext4_lookup_entry fs/ext4/namei.c:1535 [inline] ext4_lookup+0x150/0x620 fs/ext4/namei.c:1603 __lookup_hash+0xf0/0x150 fs/namei.c:1547 filename_create+0x179/0x400 fs/namei.c:3639 user_path_create fs/namei.c:3696 [inline] do_symlinkat+0xc4/0x1e0 fs/namei.c:4149 __do_sys_symlink fs/namei.c:4175 [inline] __se_sys_symlink fs/namei.c:4173 [inline] __x64_sys_symlink+0x54/0x80 fs/namei.c:4173 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45dbe7 Code: Bad RIP value. RSP: 002b:00007ffc73f2a8b8 EFLAGS: 00000206 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045dbe7 RDX: 00007ffc73f2a953 RSI: 00000000004c391a RDI: 00007ffc73f2a940 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000013 R10: 0000000000000075 R11: 0000000000000206 R12: 0000000000000001 R13: 00007ffc73f2a8f0 R14: 0000000000000000 R15: 00007ffc73f2a900 Showing all locks held in the system: 1 lock held by khungtaskd/1566: #0: 000000006085aef8 (rcu_read_lock){....}, at: debug_show_all_locks+0x5b/0x27a kernel/locking/lockdep.c:4442 1 lock held by in:imklog/7348: #0: 00000000c5c3a32a (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xa7/0xd0 fs/file.c:767 3 locks held by syz-executor.0/7843: #0: 000000000be31d8f (sb_writers#3){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 000000000be31d8f (sb_writers#3){.+.+}, at: mnt_want_write+0x3c/0xa0 fs/namespace.c:360 #1: 00000000e9785db7 (&type->i_mutex_dir_key#3/1){+.+.}, at: inode_lock_nested include/linux/fs.h:783 [inline] #1: 00000000e9785db7 (&type->i_mutex_dir_key#3/1){+.+.}, at: do_unlinkat+0x252/0x670 fs/namei.c:4051 #2: 000000000a036167 (&sb->s_type->i_mutex_key#13){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] #2: 000000000a036167 (&sb->s_type->i_mutex_key#13){+.+.}, at: vfs_unlink+0xb3/0x430 fs/namei.c:3993 3 locks held by syz-executor.3/7844: #0: 000000000be31d8f (sb_writers#3){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 000000000be31d8f (sb_writers#3){.+.+}, at: mnt_want_write+0x3c/0xa0 fs/namespace.c:360 #1: 00000000bfef82cd (&type->i_mutex_dir_key#3/1){+.+.}, at: inode_lock_nested include/linux/fs.h:783 [inline] #1: 00000000bfef82cd (&type->i_mutex_dir_key#3/1){+.+.}, at: do_unlinkat+0x252/0x670 fs/namei.c:4051 #2: 00000000781ba6d3 (&sb->s_type->i_mutex_key#13){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] #2: 00000000781ba6d3 (&sb->s_type->i_mutex_key#13){+.+.}, at: vfs_unlink+0xb3/0x430 fs/namei.c:3993 3 locks held by syz-executor.4/7847: #0: 000000000be31d8f (sb_writers#3){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 000000000be31d8f (sb_writers#3){.+.+}, at: mnt_want_write+0x3c/0xa0 fs/namespace.c:360 #1: 000000000b955002 (&type->i_mutex_dir_key#3/1){+.+.}, at: inode_lock_nested include/linux/fs.h:783 [inline] #1: 000000000b955002 (&type->i_mutex_dir_key#3/1){+.+.}, at: do_unlinkat+0x252/0x670 fs/namei.c:4051 #2: 00000000b3932eac (&sb->s_type->i_mutex_key#13){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] #2: 00000000b3932eac (&sb->s_type->i_mutex_key#13){+.+.}, at: vfs_unlink+0xb3/0x430 fs/namei.c:3993 3 locks held by syz-executor.5/7848: #0: 000000000be31d8f (sb_writers#3){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 000000000be31d8f (sb_writers#3){.+.+}, at: mnt_want_write+0x3c/0xa0 fs/namespace.c:360 #1: 00000000c8956234 (&type->i_mutex_dir_key#3/1){+.+.}, at: inode_lock_nested include/linux/fs.h:783 [inline] #1: 00000000c8956234 (&type->i_mutex_dir_key#3/1){+.+.}, at: do_unlinkat+0x252/0x670 fs/namei.c:4051 #2: 00000000ef86d3fa (&sb->s_type->i_mutex_key#13){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] #2: 00000000ef86d3fa (&sb->s_type->i_mutex_key#13){+.+.}, at: vfs_unlink+0xb3/0x430 fs/namei.c:3993 3 locks held by syz-executor.1/7849: #0: 000000000be31d8f (sb_writers#3){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 000000000be31d8f (sb_writers#3){.+.+}, at: mnt_want_write+0x3c/0xa0 fs/namespace.c:360 #1: 0000000006be3986 (&type->i_mutex_dir_key#3/1){+.+.}, at: inode_lock_nested include/linux/fs.h:783 [inline] #1: 0000000006be3986 (&type->i_mutex_dir_key#3/1){+.+.}, at: do_unlinkat+0x252/0x670 fs/namei.c:4051 #2: 00000000eaeaf4ee (&sb->s_type->i_mutex_key#13){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] #2: 00000000eaeaf4ee (&sb->s_type->i_mutex_key#13){+.+.}, at: vfs_unlink+0xb3/0x430 fs/namei.c:3993 2 locks held by syz-executor.2/28456: #0: 000000000be31d8f (sb_writers#3){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 000000000be31d8f (sb_writers#3){.+.+}, at: mnt_want_write+0x3c/0xa0 fs/namespace.c:360 #1: 00000000809af802 (&type->i_mutex_dir_key#3/1){+.+.}, at: inode_lock_nested include/linux/fs.h:783 [inline] #1: 00000000809af802 (&type->i_mutex_dir_key#3/1){+.+.}, at: filename_create+0x14d/0x400 fs/namei.c:3638 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1566 Comm: khungtaskd Not tainted 4.19.163-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x17c/0x22a lib/dump_stack.c:118 nmi_cpu_backtrace.cold.0+0x3c/0x78 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0xf6/0x11a lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x5c3/0xb40 kernel/hung_task.c:287 kthread+0x347/0x410 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 152 Comm: kworker/u4:3 Not tainted 4.19.163-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: phy6 ieee80211_iface_work RIP: 0010:unwind_next_frame.part.6+0x1ab/0xa60 arch/x86/kernel/unwind_frame.c:333 Code: 00 00 48 c7 43 50 00 00 00 00 4c 89 fe 48 89 df 4c 89 8d 60 ff ff ff 48 89 95 68 ff ff ff 48 89 8d 70 ff ff ff e8 65 f7 ff ff <48> 8b 8d 70 ff ff ff 89 c6 48 8b 95 68 ff ff ff b8 01 00 00 00 40 RSP: 0018:ffff8881f4b6f898 EFLAGS: 00000086 RAX: 0000000000000001 RBX: ffff8881f4b6f970 RCX: 1ffff1103e96df00 RDX: dffffc0000000000 RSI: ffff8881f4b6ff10 RDI: ffff8881f4b6f9b8 RBP: ffff8881f4b6f948 R08: 1ffff1103e96df38 R09: ffff8881f4b6f9a8 R10: ffff8881f4b6f920 R11: ffff8881f4b6f9cf R12: 1ffff1103e96df18 R13: 0000000000000000 R14: ffff8881f4b6fe70 R15: ffff8881f4b6ff00 FS: 0000000000000000(0000) GS:ffff8881f6500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff941bd2000 CR3: 000000000986d005 CR4: 00000000001606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: unwind_next_frame+0x35/0x40 arch/x86/kernel/unwind_frame.c:287 __save_stack_trace+0x86/0x100 arch/x86/kernel/stacktrace.c:44 save_stack_trace+0x1a/0x20 arch/x86/kernel/stacktrace.c:60 save_stack mm/kasan/kasan.c:448 [inline] set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x13c/0x220 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3503 [inline] kmem_cache_free+0x83/0x290 mm/slab.c:3765 kfree_skbmem+0x89/0xf0 net/core/skbuff.c:586 __kfree_skb net/core/skbuff.c:646 [inline] kfree_skb+0xa1/0x280 net/core/skbuff.c:663 ieee80211_iface_work+0x1f8/0x6e0 net/mac80211/iface.c:1357 process_one_work+0x7b9/0x15a0 kernel/workqueue.c:2155 worker_thread+0x85/0xb60 kernel/workqueue.c:2298 kthread+0x347/0x410 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415